Robotics Service Bus

Added cause-filter class in src/filter/cause-filter.lisp

fixes #2513

• src/filter/types.lisp (header): updated copyright
  (uuid-designator): new type; designator for a UUID
  (cause-pattern/origin): new type; a cause with unspecified sequence
  number
  (cause-pattern/sequence-number): new type; a cause with unspecified
  origin
  (cause-pattern): new type; a cause pattern
• src/filter/cause-filter.lisp: new file; contains `cause-filter' class
• src/filter/package.lisp (package rsb.filter): added exported symbols
  cause-filter and filter-cause
• test/filter/cause-filter.lisp: new file; contains unit tests for
  `cause-filter' class
• cl-rsb.asd (system cl-rsb): added file src/filter/cause-filter.lisp
  (system cl-rsb-test): added file test/filter/cause-filter.lisp